- Earth's Rotation Is Slowing Down, And Could Explain Why We Have Oxygen. Specifically, the blue-green algae (or cyanobacteria) that emerged and proliferated about 2.4 billion years ago would have been able to produce more oxygen as a metabolic by-product because Earth's days grew longer. https://www.sciencealert.com/earths-rotation-is-slowing-down-and-could-explain-why-we-have-oxygen 19 comments science
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